Assessment of Research Needs for Wind Turbine Rotor Materials Technology

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	LIST OF FIGURES	ix
	LIST OF TABLES	x
	EXECUTIVE SUMMARY	1
1	INTRODUCTION	5
	Scope and Content,	5
	Wind-Driven Power Plants,	5
	Why Materials Knowledge Is Critical,	8
	The Evolution of Wind-Driven Power Plants,	9
	The Principal Component: Wind Turbines,	12
	Power Conversion Equations,	16
	The Wind Environment,	19
	Fatigue Cycle Accumulation,	20
	References and Bibliography,	23
2	STRUCTURAL LOADING CHARACTERISTICS	25
	Load Characterization,	26
	Blade Failure Experience,	27
	Lessons from Helicopter Experience,	27
	Recommendations,	32
	References and Bibliography,	33
3	MATERIALS PROPERTIES AND LIFE PREDICTION	35
	Fibers,	35
	Matrix Materials,	39
	E-Glass/Plastic Composites,	43
	Fatigue Life Prediction,	48
	Toughness Considerations,	49
	Wood/Epoxy Composites,	50
	Recommendations,	60
	References and Bibliography,	61
4	WIND TURBINE ROTOR DESIGN	67
	Airfoil Evolution,	67
	Aerodynamic Tip Brakes,	69
	Blade Root Retention,	71
	Glass-Reinforced Plastic (GRP) Blade Roots,	71
	Wood/Epoxy Blade Roots,	75
	Blade Joining,	75
	Blade Design Considerations,	76
	Fiberglass Blades,	76
	Wood/Epoxy Blades,	78
	Recommendations,	79
	GRP,	79
	Wood/Epoxy,	79
	Generic,	79
	References and Bibliography,	80

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Assessment of Research Needs for Wind Turbine Rotor Materials Technology (1991)
Commission on Engineering and Technical Systems (CETS)

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